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Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
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Joachim Breitner d3b04871f5
perf: add checkInterrupted to inferType cache miss path (#13258) 
This PR adds a `Core.checkInterrupted` call in `checkInferTypeCache` on
cache miss, allowing cancellation to be detected during large type
inference traversals. Previously, `inferTypeImp` could run for >100ms
without any interruption check when processing large expressions (e.g.
BVDecide proof terms), making IDE cancellation unresponsive.

The check is only on cache miss (actual computation), so cache hits have
zero overhead. `checkInterrupted` is used instead of the heavier
`checkSystem` to minimize performance impact — local benchmarks show no
measurable regression on `tests/elab/5664.lean`.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
2026-04-03 06:03:55 +00:00
.claude chore: add safety notes to release command (#13225) 2026-04-01 05:01:00 +00:00
.github fix: make -DLEAN_VERSION_* CMake overrides actually work (#13226) 2026-04-01 05:31:23 +00:00
.vscode chore: fixes from #13103 "enable separate codegen" (#13241) 2026-04-02 11:13:22 +00:00
doc chore: strip binaries only in release builds (#13208) 2026-03-31 17:18:43 +00:00
images
releases_drafts chore: remove stale release draft notes (#12518) 2026-02-17 19:56:23 +00:00
script fix: make -DLEAN_VERSION_* CMake overrides actually work (#13226) 2026-04-01 05:31:23 +00:00
src perf: add checkInterrupted to inferType cache miss path (#13258) 2026-04-03 06:03:55 +00:00
stage0 chore: update stage0 2026-04-02 10:20:07 +00:00
tests feat: no default values for structure instance notation patterns (#13243) 2026-04-03 03:25:23 +00:00
.gitattributes chore: migrate more tests to new test suite (#12809) 2026-03-06 16:52:01 +00:00
.gitignore chore: replace workspace file with .vscode/ settings (#12770) 2026-03-04 01:10:04 +00:00
.gitpod.Dockerfile
.gitpod.yml chore: strip binaries only in release builds (#13208) 2026-03-31 17:18:43 +00:00
.ignore
CMakeLists.txt chore: disable flaky tests (#13253) 2026-04-02 12:59:59 +00:00
CMakePresets.json chore: strip binaries only in release builds (#13208) 2026-03-31 17:18:43 +00:00
CODEOWNERS chore: make @hargoniX code owner of the compiler (#10732) 2025-10-10 04:43:38 +00:00
CONTRIBUTING.md chore: migrate pkg tests (#12889) 2026-03-11 18:55:46 +00:00
flake.lock chore: update to c++20 (#12117) 2026-02-11 01:17:40 +00:00
flake.nix chore: add aarch64-darwin to flake (#12915) 2026-03-18 15:55:34 +00:00
lean-toolchain chore: relative lean-toolchains (#12652) 2026-02-25 10:23:35 +00:00
LICENSE
LICENSES feat: bundle leantar with Lean (#12822) 2026-03-09 20:10:59 +00:00
README.md doc: update URLs that are currently pointing to redirects (#10397) 2025-09-17 15:50:07 +00:00
RELEASES.md chore: updates to release_checklist.md (#7817) 2025-04-04 03:45:36 +00:00

README.md

This is the repository for Lean 4.

About

Installation

See Install Lean.

Contributing

Please read our Contribution Guidelines first.

Building from Source

See Building Lean.